Re: libvirt qemu/kvm/rbd inside VM read slow

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On 01/10/2014 01:21 PM, Ирек Фасихов wrote:
You need to use VirtIO.

   <target dev='vdb' bus='virtio'/>


with this parameter ist not a real performance increase:
 dd if=/dev/zero of=zerofile-2 bs=1G count=8
8+0 records in
8+0 records out
8589934592 bytes (8.6 GB) copied, 73.8425 s, 116 MB/s

and reading:

trompete@multius:~$ dd if=zerofile-2 of=/dev/null bs=1G count=8
8+0 records in
8+0 records out
8589934592 bytes (8.6 GB) copied, 429.528 s, 20.0 MB/s

Thanks,
  Steffen
-- 
______________________________________________________________________
Steffen Thorhauer

Department of Technichal and Business Information Systems (ITI)
Faculty of Computer Science (FIN)
  Otto von Guericke University Magdeburg
Universitaetsplatz 2
39106 Magdeburg, Germany

phone: 0391 67 52996
fax: 0391 67 12341
email: sth@xxxxxxxxxxxxxxxxxxxxxxx
url: http://wwwiti.cs.uni-magdeburg.de/~thorhaue        
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